void main()
{
 int n;
 int i;
 int a[100];
 double s,c1,c2,c3,c4;
 int b1=0,b2=0,b3=0,b4=0;
 scanf("%d",&n);
 s=(double)n;
 for(i=0;i<n;i++)
	 scanf("%d",&a[i]);
 for(i=0;i<n;i++)
 {
 if(a[i]<=18)
	 b1++;
 else if(a[i]<=35)
	 b2++;
 else if(a[i]<=60)
	 b3++;
 else if(a[i]>60)
	 b4++;
 }
 c1=b1/s*100;
 printf("1-18: %.2lf%%\n",c1);
 c2=b2/s*100;
 printf("19-35: %.2lf%%\n",c2);
 c3=b3/s*100;
 printf("36-60: %.2lf%%\n",c3);
 c4=b4/s*100;
 printf("60??: %.2lf%%\n",c4);

}